Summary Stage 2018:Ill-Defined Other
Summary Stage 2018
Notes
**Ill-Defined Other**
C420-C424, C761-C765, C767-C768, C770-C775, C778-C779: 8000-8700, 8720-8790, 9700-9701
C809: 8000-8040, 8042-8180, 8191-8246, 8248-8700, 8720-8790, 9700-9701
C760 and Schema Discriminator 1: Occult Head and Neck Lymph Nodes: 0, 1 (8000-8700, 8720-8790, 9700-9701)
C760-C765, C767-C768, C809
C42 and C77, Other than Hematopoietic neoplasms (9590-9992)
C420 Blood
C421 Bone marrow
C422 Spleen
C423 Reticuloendothelial system, NOS
C424 Hematopoietic system, NOS
**Other and ill-defined sites of**
C760 Head, face or neck, NOS
C761 Thorax, NOS
C762 Abdomen, NOS
C763 Pelvis, NOS
C764 Upper limb, NOS
C765 Lower limb, NOS
C767 Other ill-defined sites
C768 Overlapping lesion of ill-defined sites
**Lymph nodes of**
C770 Lymph nodes of head, face and neck
C771 Lymph nodes of intrathoracic
C772 Lymph nodes of intra-abdominal
C773 Lymph nodes of axilla or arm
C774 Lymph nodes of inguinal region or leg
C775 Lymph nodes of pelvis
C778 Lymph nodes of multiple regions
C779 Lymph nodes, NOS
C809 Unknown primary site
**Note 1:** The following sources were used in the development of this chapter
* SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) (https://seer.cancer.gov/archive/manuals/EOD10Dig.3rd.pdf)
* SEER Summary Staging Manual-2000: Codes and Coding Instructions (https://seer.cancer.gov/tools/ssm/ssm2000/)
* Collaborative Stage Data Collection System, version 02.05: https://cancerstaging.org/cstage/Pages/default.aspx
**Note 2:** *Schema Discriminator 1: Occult Head and Neck Lymph Nodes* is used to discriminate between Cervical Lymph Nodes and Unknown Primary Tumor of the Head and Neck, Ill-Defined Other and Soft Tissue Other when primary site is C760.
**Note 3:** See the following schemas for the listed histologies
* C760 (8000-8700, 8720-8790, 8941, 9700-9701: Schema Discriminator 1 Occult Head and Neck Lymph Nodes: 2, 3, 4, 5): *Cervical Lymph Nodes and Unknown Primary Tumors of the Head and Neck*
* C760 (8941: Schema Discriminator 1 Occult Head and Neck Lymph Nodes: 0,1): *Soft Tissue*
* C809 (8041, 8190, 8247): *Merkel Cell Skin*
* 8710-8714, 8800-8934, 8940-9137, 9141-9582: *Soft Tissue*
* 8935-8936: *GIST*
* 9140: *Kaposi Sarcoma*
**Note 4:** Summary Stage is the only applicable staging system for this site/histology/schema.
**Note 5:** Codes 0, 1, 2, 3, 4, and 7 are not applicable for this chapter.
Default
9
| SS2018 |
Description |
| 9 |
Unknown if extension or metastasis; unstageable |
(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998
(2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001.
(3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL)
